Watlow LogicPro Manuel d'utilisateur télécharger pdf (Page 133)

LogicPro User’s Guide Chapter 10: Function Blocks

Doc.# 28002-00 Rev 3.00 Watlow Anafaze 117

Outputs

Q is the Counter Up output bit. This bit is enabled and passes

power when the current value is equal to the preset value.

CV is the Counter Up current value. In Ladder logic, assign

this output Variable a symbolic name in the Assign

Function Block Symbolic Input/Output dialog box,

shown in Figure 10.2. In

FBD, assign a variable to this output

in the Variable Assignment dialog box. The value of this

Variable increments by one every time a False to True

transition of the counter up enable bit occurs until the current

value equals the preset value. The current value retains its

value until the reset bit is True.

Figure 10.2 Assign Function Block Symbolic

Input/Output Dialog Box

Counter Down (CTD)

The Counter Down function block, shown in Figure 10.3 on

page 118, enables an output after a preset number of

transitions from False to True occur.

CTD decrements the integer current value (CV) for every False

to True transition of the counter down enable bit (CD). The

current value continues to decrement until it reaches zero. At

this point, the output bit (Q) is enabled and remains enabled

until the function block is reset by a True condition of the load

bit (LD). When the load bit is True, the current value resets and

remains at the integer preset value (PV).

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Watlow LogicPro Manuel d'utilisateur Page 133